> ## Documentation Index
> Fetch the complete documentation index at: /docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Test mode

> Build and test against isolated test data. Your secret key selects the mode.

Test mode is an isolated environment in your account. Every endpoint works, and test data never mixes with live data.

The secret key sets the mode; the endpoints are the same, and every response carries `live_mode`.

| Mode | Secret key prefix | `live_mode` |
| :- | :- | :- |
| Test | `sk_test_` | `false` |
| Live | `sk_live_` | `true` |

Test mode is billed like live mode and has the same rate limits.

To run Connect in test mode, use the [test energy supplier](/docs/energy-api/guides/platform/test-supplier.md). To test VPP, use the [test VPP programs](/docs/energy-api/guides/platform/test-vpp-programs.md).


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.